The Merican Lancers would never need or tolerate for that matter Commissars.
Their loyalty is above question,however the Lancers benefit from the rousing speeches of the Combat Iterator.
A Combat Iterator with the right words can inspire a unit to feats of bravery.
The good ones can even make a troop try to go against Adeptus Astartes against his better judgement.
So that is what I am using for the Commissar proxies,does the same job just in a different way.
I have two standard Combat Iterators and one Combat Head Iterator(Commissar Lord)